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/*
* Copyright (C) 2008-2020 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include "WorkerRunLoop.h"
#include "WorkerThreadMode.h"
#include <wtf/Forward.h>
#include <wtf/Function.h>
#include <wtf/FunctionDispatcher.h>
#include <wtf/Lock.h>
#include <wtf/ThreadSafeRefCounted.h>
#include <wtf/threads/BinarySemaphore.h>
namespace WTF {
class Thread;
}
namespace WebCore {
class WorkerDebuggerProxy;
class WorkerLoaderProxy;
class WorkerOrWorkletThread : public SerialFunctionDispatcher, public ThreadSafeRefCounted<WorkerOrWorkletThread> {
public:
virtual ~WorkerOrWorkletThread();
void dispatch(Function<void()>&&) final;
#if ASSERT_ENABLED
void assertIsCurrent() const final;
#endif
Thread* thread() const { return m_thread.get(); }
virtual WorkerDebuggerProxy* workerDebuggerProxy() const = 0;
virtual WorkerLoaderProxy& workerLoaderProxy() = 0;
WorkerOrWorkletGlobalScope* globalScope() const { return m_globalScope.get(); }
WorkerRunLoop& runLoop() { return m_runLoop; }
void start(Function<void(const String&)>&& evaluateCallback = { });
void stop(Function<void()>&& terminatedCallback = { });
void startRunningDebuggerTasks();
void stopRunningDebuggerTasks();
void suspend();
void resume();
const String& inspectorIdentifier() const { return m_inspectorIdentifier; }
static HashSet<WorkerOrWorkletThread*>& workerOrWorkletThreads() WTF_REQUIRES_LOCK(workerOrWorkletThreadsLock());
static Lock& workerOrWorkletThreadsLock() WTF_RETURNS_LOCK(s_workerOrWorkletThreadsLock);
static void releaseFastMallocFreeMemoryInAllThreads();
void addChildThread(WorkerOrWorkletThread&);
void removeChildThread(WorkerOrWorkletThread&);
protected:
explicit WorkerOrWorkletThread(const String& inspectorIdentifier, WorkerThreadMode = WorkerThreadMode::CreateNewThread);
void workerOrWorkletThread();
// Executes the event loop for the worker thread. Derived classes can override to perform actions before/after entering the event loop.
virtual void runEventLoop();
private:
virtual Ref<Thread> createThread() = 0;
virtual RefPtr<WorkerOrWorkletGlobalScope> createGlobalScope() = 0;
virtual void evaluateScriptIfNecessary(String&) { }
virtual bool shouldWaitForWebInspectorOnStartup() const { return false; }
void destroyWorkerGlobalScope(Ref<WorkerOrWorkletThread>&& protectedThis);
static Lock s_workerOrWorkletThreadsLock;
String m_inspectorIdentifier;
Lock m_threadCreationAndGlobalScopeLock;
RefPtr<WorkerOrWorkletGlobalScope> m_globalScope;
RefPtr<Thread> m_thread;
UniqueRef<WorkerRunLoop> m_runLoop;
Function<void(const String&)> m_evaluateCallback;
Function<void()> m_stoppedCallback;
BinarySemaphore m_suspensionSemaphore;
HashSet<WorkerOrWorkletThread*> m_childThreads;
Function<void()> m_runWhenLastChildThreadIsGone;
bool m_isSuspended { false };
bool m_pausedForDebugger { false };
};
} // namespace WebCore
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